Which manufacturer of transfer factor oral liquid is better?

Transfer factor is superior to Jiangsu Sanyi, which can improve human immunity, promote the production of T lymphocytes and B lymphocytes in vivo, assist in the treatment of cancer, and enhance physical fitness. Dalian Sanyi, Jiangsu Sanyi, Heilongjiang Sanyi and Henan Sanyi are all Sanyi companies of Dr. Jiang, and Sanyi Group is the big brother of China. I really trust Sany's products, 3131, and we China Sany.